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May s, 192s. 1,668,698

C. L. RAYFIELD ELECTRICAL IGNITION SYSTEM FOR. OIL BURNERS Filed may 6. 1926 f Z V\ l l// Patented 4May '8., 1928.

CHARLES L. RAYFIELD, or cmcAGofILLINoIs", Assi PATENT OFFICE.

TUBING COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION ILLINOIS.

ELECTRICAL IGNITION SYSTEM Fon 'oTL BURNERS.

Application andl may 6,

This invention relates to a method of and an apparatus for igniting oil burners and specifically comprises a pair of electrical conductors having approaching conical terminals located adjacent but preferably not directly in the path of the oil or fuel emergingl from the nozzle, for the'purpose of producing a spark for igniting the fuel..

The invention comprises the novel struc-4 ture and combinations hereinafter described and more particularly pointed out and defined in the appended claims. c

It is believed that applicants novel method of vigniting an oil burner will be fully understood by a description of the apparatus by which the method may be practised.

In the accompanying drawings which illustrate a preferred embodiment of this invention and in which similar reference numerals refer to similar features in the different views: y

Figure 1 is an elevational view of a `fur,- nace` partly broken away showing a portion o'f the oil burner in elevation; .c

yFigure 2 is an enlarged sectional view through the nozzle of the burner showing the ignition wires in elevation;

Figure 3 is an enla'r ed sectional view through the oil burner s owing one of the conductors of the ignitionsystem with the nozzle and supply pipe in elevation.

Figure 4 is a sectional view upon the line IV-IV of Figure 3;

Figure 5 is a bottom line V-Vof Figure 3.

In the drawings there'is shown an oil burner comprising a spherical hood 1, tol which a cylindrical sleeve or casing 2is connected. The fuel nozzle 3 is supported obliquely in the hood 1. The nozzle 3 connects with an oil supply pipe 4,' which extends through the sleeve 2. The fuel entering through the pipe 4 passes through an plan view upon the aperture 5 into a centrall chamber of thev nozzle and emerges from `the chamber '6 through the intersticesv of the atomizing heads 7 which are located adjacent the out 1926.v serial N6. 107,034.

ture.

The particular structure of the burner forms no part of the present invention ex cept in so far as`it cooperates therewith. This invention concerns itself primarily with means 'for producing an electrical spark adjacent the outlet of thenozzle. To this end a pair of electrical'conductors 8 are supported on the housing. The rear ends of these conductors are turned at right an les 'gland rigidly'attachedto an insulated p ate 9 which is attached to a cylindrical 'opening in the bottomiof the sleeve 2. The attachments of the conductors to the plate 9 are preferably effected by means of inner and outer nuts 10 threaded upon the right angled portions of the conductors 8 whereby the conductors are adjustably mounted upon the plate 9 in order that their ends may be properly positioned with respect to the path of the fuel emerging from the nozzle.4

" suitable gap 12 for theproduction of a spark 'fbr igniting the fuel mixture. Any suitable `source of electrical energy may be connected vwith the conductors 8 by the supply wres 13 and 14 connected to the threaded portion of the conductors 8 by means of suitable nuts 15. It will, of course, be understood that proper transformers and high tension spark vcoils and Switches for the ignition circuit will be used in the supply circuit. They are not illustrated, as any standard construction will suffice. v

It will be'noted that the points of the electrodes 11 are slightly to the rear of the fuel discharge from thenozzle. This prevents fouling of the electrodes and at the same time, effective ignition is assured by the flow of air, (usually under pressure),

GNOR TO RAYFIELD MANUFAC- froni the nozzle to form a combustible mixsuitable through the sleeve 2 which blows thespark produced at said electrodes into the combustible mixture formed by said air and the atomized :fuel discharged -rom the nozzle'.

I am aware that numerous details of construction Inay be varied through a wide range -without departing from the principles of this invention, and I therefore do not purpose limiting the patent granted hereon, otherwise than necessitated by the prior art. i

I claim as my invention:

l. "In combination in an oil burner a tubular member comprising an air tube and having connected to -it an angularlyformed end provided with a discharge orifice, a fuel nozzle positioned in said end and ay plurality of spark electrodes each comprising an angularly bent member including a le disposed within the tubular member an connected thereto and a leg disposed in said end ofthe tube alongside of said nozzle and' means for adjusting each of said electrodes in such a manner as to enable the end of the leg of each of them adjacent the nozzle to be at all times out of the path of the jet leaving the nozzle but "sufficiently close thereto that the spark emanating from said electrodes will be blown by the air in rsaid tube into ,said jet.

2i In combination in an oil burner, a tubu-v lar member comprising an air tube, a fuel nozzle 1n an end of'said tube, s ark emitting means positioned in said tu e including spark-electrodes each comprislng an angularly bent rod including a leg disposed within the tube and a leg disposed at an angle to .the other leg and positioned alongside of the nozzle, and means for connecting each electrode to the tube in such a manner as to cause the end of the leg adjacent the nozzle prising' an angularly bent rod including a substantially horizontal leg disposed Within the tube and a slanting leg positioned alongside of the nozzle and adjustable means for connecting each electrode to the tube in such a manner as to cause the end of the slanting leg of each electrode to be disposed out of the -patli of the jet leaving .the

nozzle but sufficiently close thereto that the j emitted spark can be forced into said jet.

4. The method of igniting a burner including a fuel nozzle which consists in supplying a jet of fuel from said nozzle, creating a spark producing dilerence in electrical potential between two points adjacent and sufficiently close to the jet so that the spark can be forced into the jet and forcing the spark into the jet leaving the nozzle.

5. The method of igniting a burner including a fuel nozzle which consists in supplying a jet'of fuel from said nozzle, creating a spark producing difference in potential between two points adjacent and sufiiciently close tothe jet so that the spark can be `forced into the jet, circulating a charge of air past the nozzle for combustion purposes and utilizing said air to blow the spark into the jet leaving the nozzle.

In testimony .whereof I have hereunto subscribed my name.

- Y CHARLES L. RAYFIELD. 

